/Engine/Plugins/Runtime/LevelStreamingPersistence/Source/LevelStreamingPersistence/Public/LevelStreamingPersistenceManager.h
Sets property value and creates the entry if necessary, returns true on success.
template<typename ClassType, typename PropertyType> bool SetPropertyValue ( const [FString](API\Runtime\Core\Containers\FString) & InObjectPathName, const [FName](API\Runtime\Core\UObject\FName) InPropertyName, const PropertyType & InPropertyValue )